import java.util.ArrayList; import java.util.HashSet; import java.util.List; public class Demo { public static void main(String[] argv) { List<Integer>list1 = new ArrayList<Integer>(); list1.add(100); list1.add(200); list1.add(300); list1.add(400); list1.add(400); list1.add(500); list1.add(600); list1.add(600); list1.add(700); list1.add(400); list1.add(500); HashSet<Integer>set = new HashSet<Integer>(list1); List<Integer>list2 = new ArrayList<Integer>(set); System.out.println("List after removing duplicate elements:"); for (Object ob: list2) System.out.println(ob); } }
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